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settings: Document fts_flatcurve_optimize_density_pct #1538

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18 changes: 18 additions & 0 deletions data/settings.js
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Expand Up @@ -2505,6 +2505,24 @@ write DB. Most people should not change this setting.
Set to \`0\` to disable rotation.`
},

fts_flatcurve_optimize_density_pct: {
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@sirainen sirainen May 26, 2026

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percentage

default: 25,
values: setting_types.UINT,
plugin: 'fts-flatcurve',
advanced: true,
seealso: [ 'fts_flatcurve_rotate_count' ],
text: `
When an index shard's message count falls below this percentage of
rotate_count, the mailbox is scheduled for deferred optimization.
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@sirainen sirainen May 26, 2026

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of [[setting,fts_flatcurve_rotate_count]], ...

This helps prevent accumulation of sparse shards that degrade
mailbox open performance.

Set to \`0\` to disable density-based optimization.

This optimization requires [[setting,fts_flatcurve_rotate_count]] to be
enabled.`
},

fts_flatcurve_substring_search: {
default: 'no',
values: setting_types.BOOLEAN,
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